🛡️ Sentinel: [HIGH] Fix command injection in shell wrappers

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: Command injection vulnerabilities were present in CacheCategory.swift where dynamic user-provided input (tool) was improperly inserted into a /bin/bash -c shell execution wrapper. A similar architectural anti-pattern was fixed in CacheoutViewModel.swift for the Docker prune command.
🎯 Impact: An attacker or untrusted configuration could potentially execute arbitrary shell commands if the tool variable contained maliciously crafted shell operators.
🔧 Fix: Removed /bin/bash -c dependencies and replaced them with direct execution via Process(). The tool execution now sets executableURL = URL(fileURLWithPath: "/usr/bin/env") and safely manages parameters exclusively via the arguments array (e.g., ["which", tool] and ["docker", "system", "prune", "-f"]). Standard output and error flows were also secured to either discard unused data (FileHandle.nullDevice) or properly pipe them for safe internal usage.
✅ Verification: Execute the standard test suite. Test UI features like Docker prune handling and node_modules scanning capabilities locally on a macOS device to ensure equivalent functionality.

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PR created automatically by Jules for task 8945491455537846702 started by @acebytes

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